No-clearance rectilinear motion actuator with multiple-stage planetary roller screw pair

Abstract

The invention discloses a no-clearance rectilinear motion actuator with a multiple-stage planetary roller screw pair. A first roller nut is in threaded connection with a first-stage screw, a sliding sleeve sleeves the outer wall of a first-stage shell, the outer wall of the sliding sleeve is connected to the inner wall of an actuator shell, and the left end of a hollow screw is rotationally supported on the inner wall of the first-stage shell through a first deep groove ball bearing. A pressure cover and a limiting sleeve sleeve the first roller nut, and the limiting sleeve is fixedly connected with the first roller nut; a rolling spline housing is fixedly connected in the hollow screw, the rolling spline housing is in threaded connection with the first-stage screw, a second roller nut isin threaded connection with the hollow screw, the second roller nut is fixedly connected with a second-stage shell, and the second-stage shell is slidably connected to the inner wall of the first-stage shell through the sliding sleeve. The no-clearance rectilinear motion actuator is stable in transmission, high in transmission precision and good in using effect.

Description

Technical field: [0001] The invention relates to a multistage planetary roller screw pair gapless linear motion actuator. Background technique: [0002] At present, in order to achieve a larger original length-stroke ratio for linear motion actuators, a multi-stage operating actuator that can achieve two-stage stroke output has been developed. It mainly adopts the design of series mechanism. There is a through hole in the center of the second-stage motion shaft, which can pass through the motion of the first-stage motion shaft to realize the second-stage stroke output; the inner spline is processed in the through hole of the second-stage motion shaft, which is consistent with the first stage. The external spline fit at the end of the stage motion shaft realizes motion guidance and sliding fit. However, due to the use of sliding fit, the friction force is large during movement, which increases the wear and tear of the mechanism and reduces the movement efficiency; at the sam...

AI Technical Summary

Problems solved by technology

However, due to the use of sliding fit, the friction force is large during movement, which increases the wear and tear of the mechanism and reduces the movement efficiency; at the same time, the sliding fit has a gap, which will reduce the smoothness of movement and running accuracy during movement; therefore, it is necessary to improve the existing technology To solve the deficiencies of existing technology

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